Specification 1.Chromium molybdenum alloy steel. 2.Slightly higher carbon content than 4130. 3.Greater strength and heat treatment. 4.Good processability and easy polishing. 5.Good toughness and small quenching deformation. Application 1.Connection rods,conveyor pins. 2.Gears,stem assemblies. 3.Pump shafts and tool holders. Shape:steel plate/flat bar/round bar Technology:Hot work / Forged/cold drawn Heat treatment:Annealed / Q+T Surface condition:Black/Peeling/Polishing/Machined Delivery condition:Hot rolled or forged, Peeled or black surface Test:UT 100% / S G S Certification:ISO/mill certificate